Abstract
Abstract The effect of short-term oxidation, evaluated by using a Rolling Thin Film Oven Test, and the effect of weathering aging on the oxidation process of hydrated lime modified asphalts were studied. Hydrated lime (HL) has been known as an additive for asphalt mixtures and is now considered as a binder additive that increases asphalt mixture durability. HL was added to the binder in contents of 5, 10, 20, and 30 wt.%. The HL modified binders were aged by using the Rolling Thin Film Oven Test and weathering tests with xenon radiation. A storage stability test by measuring the softening points of HL modified binders was performed. The Thin Layer Chromatography with Flame Ionization Detection (TLC-FID) analysis was used to determine the fractions of resins, aromatics, asphaltenes and saturates of the binders. The aging of HL modified binders was evaluated by using Fourier transform infrared spectroscopy. According to the stability test, a hydrated lime concentration value close to 20 wt.% is the critical point at which there is a risk of segregation of the asphalt binder and hydrated lime during transportation and storage. For the sample weathering aged for 250 hours, a decrease of saturated and aromatic fractions, furthermore an increase in asphaltenes were observed for all samples. Results have shown that additions of 10 wt.% of hydrated lime in asphalt binders resulted in a higher photodegradation resistance among the other asphalt mixtures considering the carbonyl index, stability test and colloidal instability test results.
Highlights
Oxidation is one aspect of asphalt aging that results in volatile loss and consistency increase of the asphalt the asphalt aging process and promotes binder
Durrieu et al (2007) has reported that the influence of ultraviolet radiation on the aging of the upper layers of the asphalt pavement cannot be ignored since the degradation is rapid: after 10 hours exposure to ultraviolet radiation, the asphalt oxidation levels are similar to those achieved after being subjected to the Pressure Ageing Vessel (PAV) and Rolling Thin Film Oven Test (RTFOT), or after one year of service
The RTFOT and PAV tests mainly simulate the thermal-oxidative aging that is caused by heat and oxygen, but the photo-oxidative aging which is caused by the ultraviolet (UV) radiation and oxygen is often ignored, and there is no standardized test that allows quantitative evaluation of the photo-oxidative degradation of bitumen (Mouillet et al, 2008, Xiao et al, 2015, Kuang et al, 2014, Xu et al, 2015, Lopes et al, 2014, Araújo et al, 2013)
Summary
Oxidation is one aspect of asphalt aging that results in volatile loss and consistency increase of the asphalt the asphalt aging process and promotes binder Moisture is another variable in a cohesion loss between the aggregate and binder (stripping) (Araújo et al, 2013). Durrieu et al (2007) has reported that the influence of ultraviolet radiation on the aging of the upper layers of the asphalt pavement cannot be ignored since the degradation is rapid: after 10 hours exposure to ultraviolet radiation, the asphalt oxidation levels are similar to those achieved after being subjected to the Pressure Ageing Vessel (PAV) and Rolling Thin Film Oven Test (RTFOT), or after one year of service. Wang et al (2016) reported the strong dependence of the service life of polymer modified asphalt on its weather resistance
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